DES MOINES, Iowa (AP) — An Iowa sailor killed in the attack on Pearl Harbor in 1941 will finally be laid to rest in his home state.

The Des Moines Register reports that William James Shanahan Jr. of Cedar Rapids was killed in the Dec. 7, 1941, attack that pushed the U.S. into World War II, but his remains went unidentified for 78 years.

Shanahan’s sister, Mary Lou Shanahan Pierce, donated DNA almost 20 years ago. Finally, in May, that DNA sample found a match and William’s remains were positively identified.

A burial with full military honors is planned for Tuesday at the family plot in Cedar Rapids. Gov. Kim Reynolds has ordered all flags in Iowa to fly half-staff from sunrise to sunset to honor Shanahan.